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require 'tmpdir'
require 'fileutils'
module Custodian
module Util
class Tftp
attr_reader :hostname, :port, :filename
#
# Store hostname and port
#
def initialize(hostname, port=69)
raise ArgumentError, 'Hostname must not be nil' if hostname.nil?
raise ArgumentError, 'Hostname must be a String' unless hostname.kind_of?(String)
raise ArgumentError, 'Port must be a number' unless port.to_i > 0
@hostname = hostname
@port = port.to_i
end
#
# Returns true only if the file can be downloaded and is not zero-length.
#
def test(file)
target = Dir::Tmpname.make_tmpname('/tmp/', nil)
return false unless fetch(file, target)
return false unless File.size?(target)
return true
ensure
FileUtils.rm_f(target)
end
def fetch(file, target=nil)
# HPA's tftp client appears to have a 25s timeout that it is
# not possible to change on the command line.
return tftp("-m binary #{@hostname} #{@port} -c get #{file} #{target}")
end
def tftp(args)
return system("tftp #{args}") == true
end
end
end
end
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